Visualize where Python slicing happens

def show_slicing(text, start=0, stop=None, step=1):
    if step<1:
        print("Sorry, reverse stepping not supported in this visualization")
    else:
        sliced_text = text[start:stop:step]

        lead_space = ' '*start+'|'
        marker = '^' + (step-1)*' '
        (marks, tail) = divmod(len(text)-start, step)
        untruncated_markline = lead_space + marker*marks + 'x'*tail
        truncated_markline = untruncated_markline[:(stop+1)]+'|'
        print(f'|{text}|')
        print(f'{truncated_markline}')
        print(f'Slicing result: <{sliced_text}>')


show_slicing('The quick brown fox jumped over the lazy sleeping dog',1,-5,4)
show_slicing('The quick brown fox jumped over the lazy sleeping dog',2,13,3)
show_slicing('The quick brown fox jumped over the lazy sleeping dog',2,13,3)
show_slicing('The quick brown fox jumped over the lazy sleeping dog',2,14,3)
show_slicing('The quick brown fox jumped over the lazy sleeping dog',2,15,3)
show_slicing('The quick brown fox jumped over the lazy sleeping dog',10,13)